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Organic electroluminescent element

a technology of electroluminescent elements and organic materials, which is applied in the direction of organic semiconductor devices, thermoelectric devices, solid-state devices, etc., can solve the problems of improving efficiency and problematic fluorescent emission, and achieve the effect of high current density area and efficient white emission

Active Publication Date: 2015-10-01
IDEMITSU KOSAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention provides an organic electroluminescence device that can efficiently show a white emission in a high current density area.

Problems solved by technology

However, as compared with a phosphorescent emission, the fluorescent emission is still problematic on improving efficiency.

Method used

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  • Organic electroluminescent element
  • Organic electroluminescent element
  • Organic electroluminescent element

Examples

Experimental program
Comparison scheme
Effect test

first exemplary embodiment

[0049]FIG. 1 schematically shows an exemplary arrangement of an organic EL device according to a first exemplary embodiment of the invention.

[0050]An organic electroluminescence device 1 includes a light-transmissive substrate 2, an anode 3, a cathode 4 and an organic compound layer 10 disposed between the anode 3 and the cathode 4.

[0051]The organic compound layer 10 has a hole transporting layer 11, first emitting layer 12, space layer 13, second emitting layer 14, and electron transporting layer 16 sequentially from the anode 3. The layers are adjacent to each other.

Emitting Layer

[0052]The organic EL device 1 in the first exemplary embodiment has the first emitting layer 12 and the second emitting layer 14 as the emitting layer. The first emitting layer 12 includes a first host material, second host material, and first dopant material (first luminescent material). The second emitting layer 14 includes a third host material and a second dopant material (second luminescent material)...

second exemplary embodiment

[0234]Next, a second exemplary embodiment is described below.

[0235]In the description of the second exemplary embodiment, the same components as those in the first exemplary embodiment are denoted by the same reference signs and names to simplify or omit an explanation of the components. In the second exemplary embodiment, the same materials and compounds as described in the first exemplary embodiment are usable.

[0236]An organic EL device 1A according to the second exemplary embodiment is different from the organic EL device in the exemplary embodiment in that a third emitting layer 15 is provided adjacent to the second emitting layer 14. As shown in FIG. 9, the anode 3, hole transporting layer 11, first emitting layer 12, space layer 13, second emitting layer 14, third emitting layer 15, electron transporting layer 16, and cathode 4 are laminated on the substrate 2 in this order.

[0237]In the second exemplary embodiment, in order that the organic EL device 1A exhibits a white emissi...

third exemplary embodiment

[0243]Next, a third exemplary embodiment is described below.

[0244]In the description of the third exemplary embodiment, the same components as those in the first exemplary embodiment are denoted by the same reference signs and names to simplify or omit an explanation of the components. In the third exemplary embodiment, the same materials and compounds as described in the first exemplary embodiment are usable.

[0245]An organic EL device 1B in the third exemplary embodiment is different from the organic EL device in the first exemplary embodiment in that no space layer 13 is provided. As shown in FIG. 10, the anode 3, hole transporting layer 11, first emitting layer 12, second emitting layer 14, electron transporting layer 16, and cathode 4 are preferably laminated on the substrate 2 in this order. Moreover, the organic EL device 1B may include the anode 3, hole transporting layer 11, second emitting layer 14, first emitting layer 12, electron transporting layer 16, and cathode 4 whic...

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PUM

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Abstract

An organic electroluminescence device includes a pair of electrodes and an organic compound layer interposed therebetween. The organic compound layer includes a plurality of emitting layers at least including a first emitting layer and a second emitting layer. The first emitting layer contains a first host material and a fluorescent first luminescent material. The second emitting layer contains a second luminescent material that is different from the first luminescent material. A difference ΔST(H1) between singlet energy EgS(H1) of the first host material and an energy gap Eg77K(H1) at 77[K] of the first host material satisfies a specific relationship. One of the first luminescent material and the second luminescent material has a main peak wavelength from 400 nm to less than 500 nm and the other of the first luminescent material and the second luminescent material has a main peak wavelength from 500 nm to 700 nm.

Description

TECHNICAL FIELD[0001]The present invention relates to an organic electroluminescence device.BACKGROUND ART[0002]When voltage is applied on an organic electroluminescence device (hereinafter, occasionally referred to as an organic EL device), holes and electrons are respectively injected into an emitting layer from an anode and a cathode. The injected electrons and holes are recombined in an emitting layer to form excitons. Here, according to the electron spin statistics theory, singlet excitons and triplet excitons are generated at a ratio of 25%:75%. In the classification according to the emission principle, in a fluorescent EL device which uses an emission caused by singlet excitons, the limited value of an internal quantum efficiency of the organic EL device is believed to be 25%. On the other hand, in a phosphorescent EL device which uses an emission caused by triplet excitons, it has been known that the internal quantum efficiency can be improved up to 100% when intersystem cro...

Claims

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Application Information

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IPC IPC(8): H01L51/50
CPCH01L51/504H01L2251/552H01L2251/5376H01L51/5044H10K85/636H10K85/654H10K85/6572H10K50/131H10K50/13H10K2101/27H10K2101/30H10K2101/20H10K50/11H10K85/342H10K85/615H10K85/622H10K85/624H10K85/626H10K85/633H10K85/655H10K85/6574H10K2101/10H10K2101/90
Inventor OGIWARA, TOSHINARIJINDE, YUKITOSHI
Owner IDEMITSU KOSAN CO LTD
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